Table 1. Feature Statistics of our 811,683,028 tweet corpus.

#Unique features
User	Hashtag	Mention	Location	Term
85,794,831	13,607,023	46,391,269	18,244,772	16,212,640
Feature usage in #Tweets
Feature	Max	Avg	Median	Most frequent
User	10,196	8.67	2	running_status
Hashtag	1,653,159	13.91	1	#retweet
Mention	6,291	1.26	1	tweet_all_time
Location	10,848,224	9,562.34	130	london
Term	241,896,559	492.37	1	rt
Feature usage by #Users
Hashtag	592,363	10.08	1	#retweet
Mention	26,293	5.44	1	dimensionist
Location	739,120	641.5	2	london
Term	1,799,385	6,616.65	1	rt
Feature using #Hashtags
User	18,167	2	0	daily_astrodata
Location	2,440,969	1,837.79	21	uk